Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9SDI callsign genealogy
Currently held by WISEMAN, RICHARD D
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W9SDI's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W9SDI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9SDI, oldest first.
- WISEMAN, RICHARD D IL1988-06-14 → cancelled 2000-06-15
- RUSSELL, NATHAN IL2025-12-09 active